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The organic matter in the Upper Paleozoic strata mainly experienced hypozonal metamorphism in early stage.
上古生界有机质早期主要以深成变质作用为主；
youdao
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The organic matter in the Upper Paleozoic strata mainly experienced hypozonal metamorphism in early stage.
上古生界有机质早期主要以深成变质作用为主；
youdao